ABAP Select data from SAP table /ISDFPS/ALE_SYSTEM_DESCRIPTOR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ISDFPS/ALE_SYSTEM_DESCRIPTOR table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to /ISDFPS/ALE_SYSTEM_DESCRIPTOR. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the /ISDFPS/ALE_SYSTEM_DESCRIPTOR table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR TYPE STANDARD TABLE OF /ISDFPS/ALE_SYSTEM_DESCRIPTOR,
      WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR TYPE /ISDFPS/ALE_SYSTEM_DESCRIPTOR,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: </ISDFPS/ALE_SYSTEM_DESCRIPTOR> TYPE /ISDFPS/ALE_SYSTEM_DESCRIPTOR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/ISDFPS/ALE_SYSTEM_DESCRIPTOR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ISDFPS/ALE_SYSTEM_DESCRIPTOR
  INTO TABLE IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/ALE_SYSTEM_DESCRIPTOR
*  INTO TABLE @DATA(IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR INDEX 1 INTO DATA(WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR ASSIGNING </ISDFPS/ALE_SYSTEM_DESCRIPTOR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/ALE_SYSTEM_DESCRIPTOR>-LOGSYS = 1.
</ISDFPS/ALE_SYSTEM_DESCRIPTOR>-PLAN_CON_MODE = 1.
</ISDFPS/ALE_SYSTEM_DESCRIPTOR>-CENTRAL_SYS = 1.
</ISDFPS/ALE_SYSTEM_DESCRIPTOR>-RFCDEST = 1.
</ISDFPS/ALE_SYSTEM_DESCRIPTOR>-DELTA_T = 1.

ENDLOOP.

LOOP AT IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR INTO WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-N_MAX_REPEAT_T, sy-vline,
  WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-DELTA_O, sy-vline,
  WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-DELTA_S, sy-vline,
  WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-M_MAX_REPEAT_S, sy-vline,
  WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-DELTA_ALE_IP, sy-vline,
  WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-DELTA_ALE_IP_UPS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_/ISDFPS/ALE_SYSTEM_DESCRIPTOR TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_/ISDFPS/ALE_SYSTEM_DESCRIPTOR INTO WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CENTRAL_SYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-CENTRAL_SYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-CENTRAL_SYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CUA_SYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-CUA_SYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-CUA_SYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALE_ROUTING_SYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-ALE_ROUTING_SYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR-ALE_ROUTING_SYS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR, 
LOGSYS TYPE STRING,
PLAN_CON_MODE TYPE STRING,
CENTRAL_SYS TYPE STRING,
RFCDEST TYPE STRING,
DELTA_T TYPE STRING,
N_MAX_REPEAT_T TYPE STRING,
DELTA_O TYPE STRING,
DELTA_S TYPE STRING,
M_MAX_REPEAT_S TYPE STRING,
DELTA_ALE_IP TYPE STRING,
DELTA_ALE_IP_UPS TYPE STRING,
HANDLE_SYNC TYPE STRING,
PING_COUNT TYPE STRING,
PING_TIMEOUT TYPE STRING,
PING_MAX_LOSS TYPE STRING,
TRANSPORT_DEST TYPE STRING,
TR_FTP_HOST TYPE STRING,
TR_FTP_PW TYPE STRING,
STATE_INFO_DEST TYPE STRING,
GNR_ADMIN_DEST TYPE STRING,
USER_ADMIN_DEST TYPE STRING,
CUA_SYS TYPE STRING,
APPL_TYPE TYPE STRING,
USER_DIST TYPE STRING,
ADD_ACTGROUPS TYPE STRING,
US_FILTER TYPE STRING,
ASSIGN_ACTGROUPS TYPE STRING,
ASSIGN_PROFILES TYPE STRING,
ALE_ROUTING_SYS TYPE STRING,
EH_ORG_TYPE TYPE STRING,
EH_ORG_PLVAR TYPE STRING,
EH_ORG_UNIT TYPE STRING,
LOG_HANDLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-LOGSYS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-PLAN_CON_MODE sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-CENTRAL_SYS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-RFCDEST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-DELTA_T sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-N_MAX_REPEAT_T sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-DELTA_O sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-DELTA_S sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-M_MAX_REPEAT_S sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-DELTA_ALE_IP sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-DELTA_ALE_IP_UPS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-HANDLE_SYNC sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-PING_COUNT sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-PING_TIMEOUT sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-PING_MAX_LOSS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-TRANSPORT_DEST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-TR_FTP_HOST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-TR_FTP_PW sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-STATE_INFO_DEST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-GNR_ADMIN_DEST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-USER_ADMIN_DEST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-CUA_SYS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-APPL_TYPE sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-USER_DIST sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-ADD_ACTGROUPS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-US_FILTER sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-ASSIGN_ACTGROUPS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-ASSIGN_PROFILES sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-ALE_ROUTING_SYS sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-EH_ORG_TYPE sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-EH_ORG_PLVAR sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-EH_ORG_UNIT sy-vline 
WA_/ISDFPS/ALE_SYSTEM_DESCRIPTOR_STR-LOG_HANDLE sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.